Characterization of Stress-Dependent Resilient Modulus of Subgrade Sandy Soils by Two-Dimensional Discrete Element Method

Subgrade soils are very important materials to support highways. Current American Association of State Highway and Transportation Officials (AASHTO) pavement design procedures recommend the resilient modulus (Mr) of subgrade soils or pavement design and analysis. The primary objective of this study is to conduct numerical simulations of the resilient modulus of subgrade sandy soils under repeated triaxial loading conditions using a two-dimensional discrete elements code, e.g., particle flow code in two dimensions (PFC2D). A stress-controlled loading scheme is designed in Two-Dimensional Discrete Element Method (2D-DEM) simulations. A total of 15 loading sequences, which are composed of different combinations of confining and deviatoric stress, are applied to a generated sample. Research results show that simulated resilient modulus (Mr) is in good agreement with the real RTL laboratory testing. It is concluded that 2D-DEM is a promising tool for simulation of resilient modulus of granular materials.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 938-943
  • Monograph Title: CICTP 2014: Safe, Smart, and Sustainable Multimodal Transportation Systems

Subject/Index Terms

Filing Info

  • Accession Number: 01532903
  • Record Type: Publication
  • ISBN: 9780784413623
  • Files: TRIS, ASCE
  • Created Date: Jul 2 2014 3:02PM